Re payment for directory listing 1 If i set the billing

Hi Re payment for directory listing 1 If i set the billing period for say 1 week - does the elistimg then automatically expire? How does the plug in deal with this I want to charge a fixed fee - £1 for a week duration and then the clinet woudl have to pay or relist 2 Can I set up say a £40 per month option for unlimited listings ? Thanks for your help! Regards Phil